32 C.F.R. § 537.9
(a) Asserting demands. If a prima facie claim exists under state law, a written demand will be made against all the tortfeasors and insurers. This includes demands against the injured party's own insurance coverage, no-fault coverage and workers' compensation carrier. The earlier the demand the better. A demand will not be delayed until the exact amount of medical expenses or lost pay is determined. The demand letter will state that the amount will be furnished when known. A copy of the demand will be furnished to the injured party or, if represented, his lawyer. Two sample demand (or assertion) letters are posted at the USARCS Web site (for the address see the Note to § 537.1). Demand letters are for initial contact with insurance companies. One of the posted samples is for a medical assertion for a soldier (that includes wages). The other is for a medical assertion for a civilian (that does not include wages). Remember the following points when asserting demands:
(b) Documentation of damages. MTFs are required by AR 40-400, Patient Administration, chapter 13 to furnish complete billing documents to RJAs.